let obj = {
    "addition":function(num1,num2){
        return num1+num2;
    },
    "subtraction":function(num1,num2){
        return num1-num2;
    },
    "multiplication":function(num1,num2){
        return num1*num2;
    },
    "division":function(num1,num2){
        return num1/num2;
    },
    "go":function(num1,num2){
        console.log(num1+"+"+num2+"="+this.addition(num1,num2)+"\n"+num1+"-"+num2+"="+this.subtraction(num1,num2)+"\n"+num1+"*"+num2+"="+this.multiplication(num1,num2)+"\n"+num1+"/"+num2+"="+this.division(num1,num2));
    }
}

module.exports = obj;